You cannot make that change within the product.
To change your province of residence, you will need to submit a T1-ADJ form to the Canada Revenue Agency (CRA). The T1-ADJ form is used to make adjustments to your tax return, including changing your province of residence. You can download and print the T1-ADJ form from the CRA website: T1-ADJ T1 Adjustment Request. T1-ADJ T1 Adjustment Request
